Găsim directoriul aplicației

public class MainClass{

public static void main(String[] args){

System.out.println(System.getProperty ("user.dir"));

}

}

Calculeaza cât de repede compileaza compu programul

public class MainClass {

public static void main(String[] a) {

long start = System.currentTimeMillis();

long end = System.currentTimeMillis();

System.out.println("It took " + (end - start) + " milliseconds");

}

}

Copiem un tablou

public class MainClass {

public static void main(String[] args) {

int[] array1 = {1, 2, 3, 4};

int[] array2 = new int[array1.length];

System.arraycopy(array1, 0, array2, 0, array1.length);

for (int i : array2) {

System.out.print(" " + i);

}

}

}

Pune stringul scris cite un caracter pe rand

import java.io.IOException;

public class MainClass {

public static void main(String[] args) {

try {

char c = (char) System.in.read();

while (c != '\n') {

System.out.println(c);

c = (char) System.in.read();

}

} catch (IOException e) {

}}}